tree 005ea5008a8c73c58d34c554105679356e611109
parent 39c5df054213ab38b86a1194a32ecf5993468505
author Dmitry Lychagin <dmitry.lychagin@couchbase.com> 1588027221 -0700
committer Dmitry Lychagin <dmitry.lychagin@couchbase.com> 1588118637 +0000

[NO ISSUE][COMP] Extract SQL aggregates from CASE expressions

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
- Extracts SQL-92 aggregate functions from CASE/IF expressions
  into LET clauses, so they can be pushed into GROUPBY subplans
  by the optimizer
- Refactor AbstractSqlppExpressionExtractionVisitor to improve
  its extensibility

Change-Id: Ia1ae879e845bac5656749966ca57054cbfce6df6
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/6044
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Dmitry Lychagin <dmitry.lychagin@couchbase.com>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>